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module bindc_05_mod
use iso_c_binding, only: c_int, c_ptr, c_f_pointer, c_null_ptr, c_associated
implicit none
interface
function ax(comm_f) bind(C, name="ax")
import :: c_int, c_ptr
integer(c_int), value :: comm_f
type(c_ptr) :: ax
end function ax
end interface
contains
subroutine MPI_Barrier(comm, ierror)
integer, intent(in) :: comm
integer, intent(out), optional :: ierror
type(c_ptr) :: c_comm
integer, pointer :: fortran_ptr
! Call the C function
c_comm = ax(comm)
if (.not. c_associated(c_comm)) then
print *, "Error: Null pointer returned from C function"
if (present(ierror)) ierror = 1
return
end if
! Convert C pointer to Fortran pointer
call c_f_pointer(c_comm, fortran_ptr)
print *, "Fortran received value:", fortran_ptr
! Verify the value matches what was passed
if (fortran_ptr /= comm) then
print *, "Error: Value mismatch"
if (present(ierror)) ierror = 1
else
if (present(ierror)) ierror = 0
end if
end subroutine MPI_Barrier
end module bindc_05_mod
program bindc_05
use bindc_05_mod
implicit none
integer, parameter :: MPI_COMM_WORLD = 42 ! Non-zero value
integer :: ierr
call MPI_Barrier(MPI_COMM_WORLD, ierr)
if (ierr == 0) then
print *, "Test passed successfully"
else
print *, "Test failed"
error stop
end if
end program bindc_05
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